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Gregory Szorc's avatar
Gregory Szorc authored
Resolving parents requires reading from the changelog, which is a few
attributes and function calls away. Parents lookup occurs surprisingly
often. Micro optimizing the code to avoid redundant lookups of parents
appears to make `hg log` on my Firefox repo a little faster:

before: 24.91s
after:  23.76s
delta:  -1.15s (95.4% of original)
a29db426
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